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High-grade Haile drill hits highlight OceanaGold (TSX: OGC, NYSE: OGC)

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
6-K

Rhea-AI Filing Summary

OceanaGold Corporation reported additional high-grade drill results from its ongoing exploration and resource conversion program at the Haile Gold Mine in the United States. Recent underground drilling at Horseshoe, Ledbetter and the new Clydesdale target intersected long intervals of high gold grades that support resource conversion and potential reserve growth.

At Horseshoe Underground, highlights include 15.5 metres grading 30.64 g/t gold and 30.5 metres at 13.86 g/t gold, confirming continuity and extensions of known mineralization. Ledbetter Underground drilling returned up to 27.9 metres at 8.60 g/t gold, improving confidence in down-plunge mineralization. Early-stage drilling at Clydesdale delivered a 14.5‑metre intercept at 15.81 g/t gold, indicating an emerging high-grade zone. For 2026, about 34,500 metres of drilling are planned across Haile, focusing on resource conversion and extensions around existing and planned underground infrastructure.

Positive

  • None.

Negative

  • None.
Horseshoe high-grade intercept 15.5 m @ 30.64 g/t Au Horseshoe Underground upper zone drill hole UGD0121
Horseshoe conversion intercept 30.5 m @ 13.86 g/t Au Horseshoe Underground conversion hole UGD0113
Clydesdale high-grade intercept 14.5 m @ 15.81 g/t Au Clydesdale target hole DDH1305 including 4.5 m @ 41.60 g/t
Ledbetter strong interval 27.9 m @ 8.60 g/t Au Ledbetter Underground hole DDH1313
Horseshoe extensions drilling 4,372 m drilled 14 holes targeting Horseshoe extension conversion and extension
Ledbetter recent drilling 4,306 m drilled Eight holes completed since September 11, 2025 update
Planned Haile drilling 2026 34,500 m Total planned surface and underground drilling at Haile in 2026
Planned Pisces drilling ~6,500 m Ongoing drilling along corridor between Horseshoe and Palomino
Inferred Mineral Resources financial
"defining mineralization to an Inferred Mineral Resource category"
An inferred mineral resource is an estimate of the quantity and grade of minerals in the ground based on limited sampling and geological information, where confidence is low and continuity is uncertain. For investors it signals potential value but also higher risk—like a rough sketch of a hidden treasure that requires much more exploration and testing before you can reliably judge its size or economic worth.
Indicated Mineral Resources financial
"converting Inferred Mineral Resources to Indicated Mineral Resources category"
Indicated mineral resources are quantities and qualities of a mineral deposit estimated with a reasonable level of confidence based on spaced sampling and analysis, sitting between a rough guess and a high-certainty measurement. For investors, they matter because they support preliminary economic studies and mine planning—think of them as a reasonably reliable shopping list for a recipe, useful for deciding whether to invest further but not yet proof that profitable extraction is guaranteed.
Mineral Reserves financial
"The Horseshoe Underground has defined Mineral Reserves"
Mineral reserves are the amounts of a metal or mineral that a company has identified and can legally and economically extract with current technology. Think of it like the usable fuel in a car’s tank rather than all the oil in the ground; reserves determine how long a mine can produce, help estimate future revenue and costs, and shape a company’s value and investment risk.
NI 43-101 regulatory
"a qualified person under National Instrument 43-101 – Standards of Disclosure"
A Canadian regulatory standard that sets the rules for how mining and exploration companies must report mineral resources and reserves, requiring technical reports prepared or signed off by an independent, certified expert. It matters to investors because it creates a consistent, transparent “inspection report” for mining projects, making it easier to compare prospects, judge the reliability of claims, and assess geological and financial risk before investing.
Quality Assurance and Quality Control ("QA/QC") technical
"Quality Assurance and Quality Control ("QA/QC")"
forward-looking statements regulatory
"This news release contains certain "forward-looking statements""
Forward-looking statements are predictions or plans that companies share about what they expect to happen in the future, like estimating sales or profits. They matter because they help investors understand a company's outlook, but since they are based on guesses and assumptions, they can sometimes be wrong.

 

 

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

Form 6-K

 

 

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 OF
THE SECURITIES EXCHANGE ACT OF 1934

 

 

For the month of May, 2026

 

Commission File Number: 001-43215

 

___________________

 

OceanaGold Corporation

(Translation of registrant's name into English)

 

Suite 1020, 400 Burrard Street

Vancouver, British Columbia V6C 3A6

Canada

(Address of principal executive offices)

___________________

 

 

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

 

Form 20-F Form 40-F

 

 

 

 

 

 

 

 
 



EXHIBIT INDEX

 

 

Exhibit Description
   
99.1 News Release dated May 12, 2026

 

 

 FORM 6-K

 

SIGNATURES

 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

 

  OceanaGold Corporation
   
Date: May 12, 2026 By: /s/ Marius van Niekerk
  Name: Marius van Niekerk
  Title: Executive Vice President, Chief Financial Officer

Exhibit 99.1

 

 

 

 

OceanaGold Announces Additional High-Grade Drill Results at Haile

VANCOUVER, BC, May 12, 2026 /CNW/ - OceanaGold Corporation (TSX: OGC) (NYSE: OGC) ("OceanaGold" or the "Company") is pleased to announce high-grade results from its ongoing exploration and resource conversion drilling program at the Haile Gold Mine ("Haile") in the United States.

Drilling Highlights (core length):

Horseshoe Underground (conversion and extension drilling):

  • 15.5 m @ 30.64 g/t Au (UGD0121)
  • 30.5 m @ 13.86 g/t Au (UGD0113)
  • 22.5 m @ 13.42 g/t Au (UGD0122)
  • 18.4 m @ 9.62 g/t Au (UGD0119)
  • 21.9 m @ 6.48 g/t Au including 3.7 m @ 23.55 g/t Au (UGD0120)
  • 26.3 m @ 3.41 g/t Au and 44.3 m @ 3.72 g/t Au (UGD0107)

Ledbetter Underground (conversion drilling):

  • 27.9 m @ 8.60 g/t Au (DDH1313)
  • 27.9 m @ 4.16 g/t Au (DDH1319)
  • 18.4 m @ 3.68 g/t Au (DDH1317)
  • 13.0 m @ 2.25 g/t Au and 17.1 m @ 8.20 g/t Au (DDH1283)
  • 2.6 m @ 9.63 g/t Au and 3.3 m @ 40.45 g/t Au (DDH1315)

Clydesdale (initial drilling):

  • 14.5 m @ 15.81 g/t Au including 4.5 m @ 41.6 g/t Au (DDH1305)

Gerard Bond, President and CEO of OceanaGold, said "Our ongoing exploration success at Haile continues to demonstrate our ability to add tremendous value through the drill bit. At Horseshoe, recent drilling points to reserve growth potential near existing infrastructure, with mineralization still open in multiple directions. Results from Ledbetter are strengthening confidence in down-plunge resource conversion, and a new significant high-grade intercept at Clydesdale confirms its potential as an emerging target area. As development of the Palomino decline progresses, we look forward to advancing these opportunities with further drilling from underground in the near term."

 Drill results can be viewed in 3D using VRIFY at the following link:

https://vrify.com/meetings/recordings/3777660f-584a-43cb-82cc-c8fc9e773b08

VRIFY note: Drill results reflect only those set forth in OceanaGold's press release dated May 12, 2026, and do not include all historical drill results except those relevant to the current targets in this release.


Figure 1: Plan view map showing new drillhole locations. (CNW Group/OceanaGold Corporation)

Horseshoe Underground

The Horseshoe Underground has defined Mineral Reserves (see news release dated February 18, 2026) as well as three discrete zones of mineralization to the southwest (Horseshoe extensions), known as the upper (surface to 900mRL), middle (900mRl to 730mRL) and lower (below 730mRL) zones. Notably, all three of these zones are near both existing and planned underground development infrastructure. Success from the 2025 exploration program added Inferred Mineral Resources to the upper zone for the first time, while also expanding the Inferred Mineral Resources in the middle and lower zones. On the main Horseshoe orebody, the 2025 resource estimate resulted in conversion of Inferred to Indicated Mineral Resources in the lower mineralized zones. The 2026 drill program focuses on both resource conversion and extension of the main Horseshoe orebody and the three zones at Horseshoe extensions.

At Horseshoe extensions (Figure 1), drilling totalling 14 holes for 4,372 m has targeted both conversion and extension opportunities. In the upper zone, the results of two holes - 15.5 m @ 30.64 g/t Au (UGD0121) and 18.4 m @ 9.62 g/t Au (UGD0119), confirm the continuity of the mineralization. Results from two extension holes in the upper zone - 21.9 m @ 6.48 g/t Au including 3.7 m @ 23.55 g/t Au (UGD0120) and 22.5 m @ 13.42 g/t Au (UGD0122), support expansion of the known mineralization in the area (Figure 2).

Significant results between the middle and lower zones include 25.8 m @ 3.63 g/t Au (UGD0126) and 16.4 m @ 4.11 g/t Au (UGD0104), extending known mineralization to the west (Figure 2). Extensional drilling at the bottom of the lower zone returned 26.3 m @ 3.41 g/t Au and 44.3 m @ 3.72 g/t (UGD0107), adding mineralization at depth outside of the known resource. The lower zone remains open in multiple directions with additional follow-up drilling planned in this area (Figure 2).

Since the last resource estimate, conversion drilling totalling 1,258 m in 4 holes has continued to target conversion of Inferred Mineral Resources in the lower levels of the main Horseshoe orebody (Figure 2). Notable intercepts include: 12.2 m @ 24.14 g/t Au (UGD0112); and 30.5 m @ 13.86 g/t Au (UGD0113). These results are in-line with the resource model and are expected to be included the next reserve update.


Figure 2: Schematic long section (looking northwest) showing Horseshoe mineralization with recent significant intercepts highlighted. (CNW Group/OceanaGold Corporation)

Ledbetter Underground

The Company announced in February 2026 a change in the mining method for the final pit phase of Ledbetter to an underground mining mine. This has expanded the exploration opportunity at Ledbetter, as mineralization outside the prior pit shell is now potentially economic.

In 2025, the Company began a drill program targeting known mineralization with the goal of converting Inferred Mineral Resources and increasing confidence down plunge of the existing reserve in an area referred to as Lobe 3. Eight holes have been drilled since the Company's news release dated September 11, 2025, with new drilling totalling 4,306 m. The highlight of the Ledbetter drilling is 27.9 m @ 4.16 g/t Au (DDH1319) in Lobe 3, which has infilled a gap in known resources, demonstrating continuity of high-grade mineralization. To the northeast, holes DDH1315 and DDH1317 targeted the conversion of Inferred Mineral Resources and returned higher grades than the model predicted, including a result of 18.44 m @ 3.68 g/t Au (DDH1317) (Figure 3).


Figure 3: Plan view level section showing Ledbetter underground mineralization with recent significant intercepts highlighted. (CNW Group/OceanaGold Corporation)

Advanced Drilling Targets – Clydesdale & Pisces

The Clydesdale target is located 100 m northwest of Palomino and approximately 300 m stratigraphically lower at approximately 800 m below surface. Drilling continues at Clydesdale with early-stage exploration results now reporting a second mineralized intercept showing good width and grade of 14.5 m @ 15.81 g/t Au (DDH1305) (refer to VRIFY). The Company has now defined two mineralized intercepts in this area (DDH1282, 6.2 m @ 4.11 g/t Au, previously reported), with additional drilling ongoing to further define the potential of this new mineralized zone.

The Pisces target is located along the corridor between the Horseshoe and Palomino deposits at approximately 550 m below surface and close to existing and planned underground infrastructure. Drilling at Pisces is ongoing, with ~6,500 m planned. The work is focused on further understanding the distribution of the high-grade mineralization in the area.

2026 Exploration Program

There are approximately 34,500 m of drilling planned at Haile for 2026 from both surface and underground. Drilling will continue to focus on resource conversion at Horseshoe Underground, including targeting expansions of the upper, middle and lower zones to the southwest. At Ledbetter Underground, drilling will continue to infill and test extensions to Lobe 3. Clydesdale and Pisces drilling will also continue from surface through the year, with the ability to accelerate the program once the Palomino decline is in place, providing access to new drill locations at shorter distances. Results from recent drilling and ongoing refinement of the geologic model have resulted in a better understanding on the structural controls on mineralization, allowing for the systematic generation of targets to be explored in the coming years.

Table 1: Haile drill intersections subsequent to the news release dated September 11, 2025, results update.

Drill Hole ID From (m) To (m) Interval (m)* Au (g/t) Target Activity
UGD0104 294.7 311.1 16.4 4.11 Horseshoe Extension
UGD0107 266.4 292.7 26.3 3.41 Horseshoe Extension
And 305.6 349.9 44.3 3.72 Horseshoe Extension
UGD0108 NSR Horseshoe Extension
UGD0112 217.9 238.7 20.8 2.06 Horseshoe Conversion
And 244.6 256.8 12.2 24.14 Horseshoe Conversion
UGD0113 243.2 273.7 30.5 13.86 Horseshoe Conversion
UGD0114 267.7 277.9 10.2 1.59 Horseshoe Conversion
UGD0115 NSR Horseshoe Conversion
UGD0116 251.6 256.2 4.6 3.20 Horseshoe Extension
UGD0117 NSR Horseshoe Extension
UGD0118 233.6 241.3 7.7 1.95 Horseshoe Extension
UGD0119 151.6 170.1 18.4 9.62 Horseshoe Extension
UGD0120 164.2 186.1 21.9 6.48 Horseshoe Extension
Including 172.8 176.5 3.7 23.55 Horseshoe Extension
UGD0121 185.4 201.9 15.5 30.64 Horseshoe Extension
UGD0122 197.5 220.0 22.5 13.42 Horseshoe Extension
UGD0123 NSR Horseshoe Extension
UGD0124 NSR Horseshoe Extension
UGD0125 NSR Horseshoe Extension
UGD0126 308.0 333.8 25.8 3.63 Horseshoe Extension
Including 325.6 326.4 0.9 42.30 Horseshoe Extension
DDH1305 797.0 811.5 14.5 15.81 Clydesdale Initial Drilling
Including 797.0 801.4 4.5 41.60 Clydesdale Initial Drilling
DDH1318 NSR Clydesdale Initial Drilling
DDH1283 466.5 479.5 13.0 2.25 Ledbetter 04 Conversion
And 494.5 511.6 17.1 8.20 Ledbetter 04 Conversion
Including 502.5 506.8 4.3 16.24 Ledbetter 04 Conversion
DDH1309 NSR Ledbetter 04 Conversion
DDH1311 485.9 491.8 5.9 3.66 Ledbetter 04 Conversion
DDH1312     NSR   Ledbetter 04 Conversion
DDH1313 486.6 514.5 27.9 8.60 Ledbetter 04 Conversion
Including 486.6 490.8 4.2 23.11 Ledbetter 04 Conversion
Including 508.9 511.5 2.6 15.67 Ledbetter 04 Conversion
DDH1315 489.0 491.6 2.6 9.63 Ledbetter 04 Conversion
And 498.1 501.4 3.3 40.45 Ledbetter 04 Conversion
Including 498.1 499.9 1.8 73.70 Ledbetter 04 Conversion
DDH1317 489.5 508.0 18.4 3.68 Ledbetter 04 Conversion
DDH1319 456.1 484.0 27.9 4.16 Ledbetter 04 Conversion
DDH1295 NSR Pisces Extension
DDH1298 NSR Pisces Extension
UGD0109 NSR Pisces Extension
UGD0110 NSR Pisces Extension
UGD0111 NSR Pisces Extension
DDH1307 NSR Pisces Extension
DDH1316 656.1 672.5 16.4 2.68 Pisces Extension
               

*Notes: Intervals are down hole core length, true widths have not been determined. "Initial Drilling" intercepts are associated with early-stage exploration drilling, "Extension" drilling intercepts are intercepts outside the current resource model shell directed at defining mineralization to an Inferred Mineral Resource category and "Conversion" drilling intercepts are intercepts converting Inferred Mineral Resources to Indicated Mineral Resources category. NSR = No Significant Result.

For further information relating to drill hole data, please refer to the Company's website at https://oceanagold.com/operations/additional-drillhole-data.

About OceanaGold

OceanaGold is a global intermediate gold and copper producer committed to safely and responsibly maximizing the generation of Free Cash Flow from our operations and delivering strong returns for our shareholders. We have a portfolio of four operating mines: the wholly-owned Haile Gold Mine in the United States of America; the wholly-owned Macraes and Waihi operations in New Zealand; and the 80%-owned Didipio Mine in the Philippines.

For further information please contact:

Investor Relations:

Rebecca Henare, VP, Investor Relations
Tel: +1 604-678-4095
ir@oceanagold.com 

Valerie Burns, Manager, Investor Relations
Tel: +1 604-235-0742
ir@oceanagold.com

Media Relations:

Louise Burgess, VP, Communications
Tel: +1 604-403-2019
media@oceanagold.com

Qualified Person Statement

The scientific and technical information in this press release has been reviewed and approved by Mr. Keenan Jennings, a qualified person under National Instrument 43-101 – Standards of Disclosure for Mineral Projects of the Canadian Securities Administrators ("NI 43-101"). Mr. Jennings is the EVP, Chief Exploration Officer of OceanaGold.

Quality Assurance and Quality Control ("QA/QC")

From July 2017 to 2025, almost all Haile exploration core samples have been prepared at the ALS lab in Tucson, Arizona, and analyzed at the ALS lab in Reno, Nevada, each of which is independent from OceanaGold. Select resource conversion core samples were also prepared and analyzed at the SGS lab in Kershaw, South Carolina in 2025, which is also independent from OceanaGold, with confirmation pulp duplicates sent to the ALS lab in Reno, Nevada. Samples are pulverized from a 250g (ALS) or 450g (SGS) sample to 85% passing 75 mesh. Approximately 225g of pulp sample is used for fire assay. Assays are based on a 30g fire assay aliquot for gold with Atomic Absorption finish. If the gold value from Atomic Absorption is >10g/t, an additional 30g of pulp sample is fire assayed for gold using a gravimetric finish.

Some holes are composited and analyzed for carbon, sulphur and multi-elements using LECO and ICP-OES methods. Both ALS and SGS labs used for OceanaGold samples are ISO 17025 certified.

Blanks and standards are each inserted every 20th sample. Precision and accuracy of certified reference materials ("CRMs") compared to expected values have been consistently within 5% RSD and often within 3%. Barren marble and sand are inserted as blanks every 20th sample. CRMs from RockLabs and OREAS are inserted every 20th sample (5%). All blanks and CRMs are handled by the OceanaGold Geology Team and are stored in the locked OceanaGold office.

All drill hole samples are handled and transported from the drill rigs to the secured Haile Exploration warehouse by OceanaGold personnel or contractors. Access to the property is controlled by locked doors and cameras monitored by OceanaGold security. The main gate requires an electronic employee badge to enter. Samples are packaged at the Haile Exploration warehouse by OceanaGold geologists and geotechnicians. Samples are trucked in sealed plastic barrels by certified couriers with submittal forms that are verified during sample pick-up and delivery to ALS. No sample shipments have been recorded as missing or tampered with.

Technical Report

For further information, please refer to the following NI 43-101 technical report available on the SEDAR+ website at www.sedarplus.ca under the Company's profile or on the Company's website at www.oceanagold.com: "NI 43-101 Technical Report Haile Gold Mine Lancaster County, South Carolina" dated March 27, 2026, with an effective date of December 31, 2025 prepared by D. Carr, Group Head of Metallurgy, G. Hollett, Group Head of Mining Engineering, B. Drury, Underground Engineering Superintendent, J. Moore, Group Head of Resource Development and D. Corley, Principal Resource Development Geologist (OceanaGold), L. Standridge and R. Cook (Call and Nicholas, Inc.), J Newton Janney-Moore and W.L. Kingston (NewFields Mining Design & Technical Services, LLC) and B. Miller (SRK Consulting (U.S.), Inc.). Each of Messrs. Carr, Hollett, Moore and Corley and Ms. Drury is an employee of OceanaGold.

Cautionary Statement for Public Release

This news release contains certain "forward-looking statements" and "forward-looking information" (collectively, "forward-looking statements") within the meaning of applicable Canadian and United States securities laws which may include, but are not limited to, statements with respect to: the future exploration activities at Haile and the anticipated benefits therefor; anticipated exploration results and developments at Haile in future periods; the estimation, realization and classification of Mineral Reserves and Mineral Resources at Haile; the potential for Mineral Reserves growth at Horseshoe, Mineral Resources conversion at Ledbetter and Clydesdale as an emerging target area; anticipated advancement of exploration opportunities with further drilling as development of the Palomino decline progresses; anticipated expansion of the exploration opportunity at Ledbetter; estimates of exploration expenditures; timing of the development of new deposits; the timing, cost and outcome of exploration activities; timing and focus of the 2026 exploration and drilling programs at Haile; and geotechnical and operational conditions. All statements in this news release that address events or developments that the Company expects to occur in the future are forward-looking statements. Forward-looking statements are statements that are not historical facts and are generally, although not always, identified by words such as "may", "plans", "expects", "projects", "is expected", "scheduled", "potential", "estimates", "forecasts", "intends", "targets", "aims", "anticipates" or "believes" or variations (including negative variations) of such words and phrases, or may be identified by statements to the effect that certain actions, events or results "may", "could", "would", "should", "might" or "will" be taken, occur or be achieved.

Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such risks include, among others: the risk of not achieving the Company's production estimates, forecasts or 2026 Guidance; inaccuracy of Mineral Reserves, Mineral Resources and operating and capital cost estimates; the actual results of current and future production, development and/or exploration activities; possible variations of ore grade, metallurgy or recovery rates; changes in mine plans, project parameters or assumptions as plans continue to be refined; delays in, or inability to complete, development or construction or expansion activities or to re-commence or sustain operations as planned; failures or underperformance of plant, equipment, infrastructure or processes; geotechnical risks or events, including open pit wall stability, crown pillar failure, land subsidence and tailings dam failures; scarcity in and disruption of global supply chain and/or increases in prices, including as a result of international conflicts, such as the recent U.S.-Iran conflict; challenges associated with effective water management; environmental, health and safety and climate-related risks; risks related to community acceptance, stakeholder engagement and social licence to operate; competition for mineral properties and other growth opportunities; legal and regulatory challenges to current and future permits, certifications, approvals or licences; adverse judicial, regulatory or governmental decisions; delays in, or inability to obtain, financing or governmental approvals on acceptable terms; changes in laws, regulations, taxation regimes, regulated accounting standards or their interpretation or application; the risks associated with operating in foreign jurisdictions, including political instability, changes in policy or law, civil unrest or conflict; fluctuations in the prices of gold, copper and silver; general business, economic and market conditions (including changes in global, national or regional financial, credit, currency or securities markets); changes or developments in global, national or regional political and social conditions; fluctuations in foreign exchange rates, including the value of the U.S. dollar relative to the Canadian dollar, the New Zealand dollar or the Philippine peso; trade policies and tensions, including tariffs; inflationary pressure; labour availability, retention and turnover; accidents, labour disputes and other operational risks of the mining industry; limitations of insurance coverage or uninsured risks; the conclusions of economic evaluations, studies and models; information technology, artificial intelligence and cybersecurity risks; and those other factors identified and described in more detail in the section entitled "Risk Factors" contained in the Company's most recent Annual Information Form and the Company's other filings with Canadian securities regulators and the U.S. Securities and Exchange Commission (the "SEC"), which are available under the Company's profile on SEDAR+ at sedarplus.ca and sec.gov, respectively, and on the Company's website at oceanagold.com. The list is not exhaustive of the factors that may affect the Company's forward-looking statements.

The Company's forward-looking statements are based on the applicable assumptions and factors Management considers reasonable as of the date hereof, based on the information available to Management at such time. These assumptions and factors include, but are not limited to, assumptions and factors related to the Company's ability to carry on current and future operations, including: exploration and development activities; the timing, extent, duration and economic viability of such operations; the accuracy and reliability of estimates, projections, forecasts, studies and assessments; the Company's ability to meet or achieve Guidance, estimates, projections and forecasts; the availability and cost of inputs; the price and market for outputs, including gold, copper and silver; foreign exchange rates; taxation levels; the timely receipt of necessary permits, certifications, approvals or licences; the ability to meet current and future obligations; the ability to obtain timely financing on reasonable terms when required; the current and future social, economic and political conditions; and other assumptions and factors generally associated with the mining industry.

The Company's forward-looking statements are based on the opinions and estimates of Management and reflect their current expectations regarding future events and operating performance and speak only as of the date hereof. The Company does not assume any obligation to update forward-looking statements if circumstances or Management's beliefs, expectations or opinions should change other than as required by applicable laws. There can be no assurance that forward-looking statements will prove to be accurate, and actual results, performance or achievements could differ materially from those expressed in, or implied by, these forward-looking statements. Accordingly, no assurance can be given that any events anticipated by the forward-looking statements will transpire or occur, or if any of them do, what benefits or liabilities the Company will derive therefrom. For the reasons set forth above, undue reliance should not be placed on forward-looking statements.

Cautionary Statements for United States Readers

The scientific and technical disclosure in this news release was prepared in accordance with Canadian National Instrument 43-101 - Standards of Disclosure for Mineral Projects ("NI 43-101"), which differs from the scientific and technical disclosure requirements of the SEC that are applicable to domestic United States reporting companies. Any Mineral Reserves and Mineral Resources reported by the Company in accordance with NI 43-101 may not qualify as such under SEC standards, including Subpart 1300 of Regulation S-K under the United States Exchange Act of 1934, as amended. Accordingly, Mineral Resources and Mineral Reserves information and other scientific and technical information contained or referenced in this news release may not be comparable to similar scientific and technical information disclosed by United States public companies subject to the reporting and technical disclosure requirements of the SEC. Historical results or feasibility models presented herein are not guarantees or expectations of future performance. Mineral resources that are not mineral reserves do not have demonstrated economic viability. Due to the uncertainty of measured, indicated or inferred mineral resources, these mineral resources may never be upgraded to proven and probable mineral reserves. Investors are cautioned not to assume that any part of mineral deposits in these categories will ever be converted into reserves or recovered. In addition, United States investors are cautioned not to assume that any part or all of the Company's measured, indicated or inferred mineral resources constitute or will be converted into mineral reserves or are or will be economically or legally mineable without additional work.

View original content to download multimedia:https://www.prnewswire.com/news-releases/oceanagold-announces-additional-high-grade-drill-results-at-haile-302769050.html

SOURCE OceanaGold Corporation

 

View original content to download multimedia: http://www.newswire.ca/en/releases/archive/May2026/12/c2499.html

%CIK: 0001487326

CO: OceanaGold Corporation

CNW 07:00e 12-MAY-26

 

FAQ

What did OceanaGold (OGC) report in its latest Haile drilling update?

OceanaGold reported new high-grade drill results from its Haile Gold Mine. The update highlights strong underground intercepts at Horseshoe, Ledbetter and Clydesdale, supporting resource conversion, extensions of known mineralization and the potential for future reserve growth at the operation.

What are the highest-grade drill intercepts reported at Horseshoe Underground by OceanaGold (OGC)?

Key Horseshoe intercepts include 15.5 metres at 30.64 g/t gold and 30.5 metres at 13.86 g/t gold. Additional intervals between roughly 16 and 26 metres with grades above 3 g/t gold extend mineralization in upper, middle and lower zones near existing underground infrastructure.

What new drilling results did OceanaGold (OGC) announce for Ledbetter Underground?

Ledbetter Underground drilling returned 27.9 metres at 8.60 g/t gold and 27.9 metres at 4.16 g/t gold. Several other holes reported multi‑metre intercepts above 3 g/t gold, infilling gaps and converting Inferred Mineral Resources down plunge of the existing reserve in the Lobe 3 area.

Why is the Clydesdale target important in OceanaGold’s (OGC) Haile program?

Clydesdale is an emerging high-grade target northwest of Palomino, about 800 metres below surface. Drilling returned 14.5 metres at 15.81 g/t gold, including 4.5 metres at 41.6 g/t, and follows an earlier 6.2‑metre intercept, suggesting a potentially meaningful new mineralized zone.

How much drilling is planned at Haile by OceanaGold (OGC) in 2026?

OceanaGold plans approximately 34,500 metres of drilling at Haile in 2026. The program focuses on converting resources and testing extensions at Horseshoe and Ledbetter, while continuing surface drilling at Clydesdale and Pisces, with future underground access expected to improve drill locations.

Who is the qualified person for OceanaGold’s (OGC) Haile drilling results?

The scientific and technical information was reviewed and approved by Mr. Keenan Jennings. He is OceanaGold’s Executive Vice President, Chief Exploration Officer and a qualified person under Canada’s NI 43‑101 Standards of Disclosure for Mineral Projects.

Filing Exhibits & Attachments

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